<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<style>
    img{
        width: 300px;
        display: block;
        margin: 20px auto;
        /* 针对图片不透明的区域进行添加阴影*/
        filter: drop-shadow(10px 10px 10px #000);
    }

    .pop{
        width: 200px;
        height: 100px;
        color: #fff;
        background: #409eff;
        position: absolute;
        display: flex;
        justify-content: center;
        align-items: center;
        margin-left: 200px;
        filter: drop-shadow(0px 0px 10px #000);
    }

    .pop:after{
        content: '';
        position: absolute;
        top: 40%;
        left: -10px;
        width: 20px;
        height: 20px;
        background: #409eff;
        transform: rotate(45deg);
    }
</style>

<img src="https://picsum.photos/200/200" alt="">

<div class="pop">气泡框</div>
</body>
</html>